Q: Bi Statistics, DataManager time = 0?
Hi Experts,
We are currently analyzing our query performance using BI Statistcs (Bi7.0, SPS12). We are having problems fully understanding the values in the InfoCube 0TCT_C01.
We have made a custom query and drill down on query step. When looking at this result, if the "counter for queries" key figure (0TCTQUCOUNT) is 0, then we assume this means that it is an open or close of a query, and if the "counter for queries" = 1, then it is a data fetch (i.e. initial load of query, drill down or filtering).
If the above is correct, then if "counter for queries" = 1 and "Time DataManager" (0TCTTIMEDM) = 0, then we assume that this means a cached navigation. This does however seem a bit strange, since that would mean that almost all of our navigations are cached.
Does anybody have a good explanation to what the char & key figures mean? I have looked at the documentation at help.sap.com (http://help.sap.com/saphelp_nw70/helpdata/en/46/f9bd5b0d40537de10000000a1553f6/frameset.htm) but I find this rather useless.
Thank you in advance,
Mikael
We have found that "counter for queries" = 1 and "Time DataManager" (0TCTTIMEDM) = 0 could also mean that the user has performed a filtering.
I.e. this combination could mean either cached navigation OR filter. I have checked all key figures and characteristics in the MultiProvider, and it does not seem as there is any way to separate these two, which then makes it impossible to find out how many cached navigations are performed.
Does anybody have any idea?
Thank you in advance,
Mikael
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>
When the STATISTICS_LEVEL parameter is modified by ALTER SYSTEM, all advisories or statistics are dynamically turned on or off, depending on the new value of STATISTICS_LEVEL. When modified by ALTER SESSION, the following advisories or statistics are turned on or off in the local session only. Their system-wide state is not changed:
Timed statistics
Timed OS statistics
Plan execution statistics
>
HTH
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TCP_SEND_SIZE_MIN 4,096
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User I/O 8,949 0 56 6 48.74
DB CPU 29 24.66
System I/O 1,916 0 3 1 2.18
Other 506 88 1 2 0.92
Configuration 2 50 1 500 0.86
Commit 37 0 1 18 0.56
Application 20 0 0 17 0.29
Network 4,792 0 0 0 0.01
Concurrency 1 0 0 0 0.00
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Foreground Wait Events
• s - second, ms - millisecond - 1000th of a second
• Only events with Total Wait Time (s) >= .001 are shown
• ordered by wait time desc, waits desc (idle events last)
• %Timeouts: value of 0 indicates value was < .5%. Value of null is truly 0
Event Waits %Time -outs Total Wait Time (s) Avg wait (ms) Waits /txn % DB time
db file scattered read 3,456 0 17 5 59.59 14.92
db file sequential read 4,304 0 17 4 74.21 14.77
direct path read temp 764 0 17 22 13.17 14.31
direct path write temp 259 0 5 21 4.47 4.70
control file sequential read 1,916 0 3 1 33.03 2.18
ADR block file read 38 0 1 28 0.66 0.92
log buffer space 2 50 1 500 0.03 0.86
log file sync 37 0 1 18 0.64 0.56
enq: RO - fast object reuse 14 0 0 24 0.24 0.29
local write wait 44 0 0 1 0.76 0.03
SQL*Net message to client 4,772 0 0 0 82.28 0.01
Disk file operations I/O 110 0 0 0 1.90 0.00
ADR block file write 7 0 0 0 0.12 0.00
SQL*Net message from client 4,773 0 15,396 3226 82.29
Streams AQ: waiting for messages in the queue 720 100 3,600 5000 12.41
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Background Wait Events
• ordered by wait time desc, waits desc (idle events last)
• Only events with Total Wait Time (s) >= .001 are shown
• %Timeouts: value of 0 indicates value was < .5%. Value of null is truly 0
Event Waits %Time -outs Total Wait Time (s) Avg wait (ms) Waits /txn % bg time
control file sequential read 4,950 0 35 7 85.34 40.74
control file parallel write 1,262 0 31 25 21.76 36.46
log file parallel write 383 0 4 10 6.60 4.37
db file parallel write 627 0 2 3 10.81 2.36
change tracking file synchronous read 56 0 2 34 0.97 2.21
os thread startup 17 0 1 88 0.29 1.74
ADR block file read 135 0 1 7 2.33 1.04
change tracking file synchronous write 56 0 1 15 0.97 0.98
SGA: allocation forcing component growth 8 100 1 100 0.14 0.93
db file sequential read 112 0 1 6 1.93 0.75
process diagnostic dump 94 0 0 1 1.62 0.09
ADR block file write 92 0 0 1 1.59 0.07
LGWR wait for redo copy 11 0 0 1 0.19 0.01
log file sync 2 0 0 3 0.03 0.01
ADR file lock 92 22 0 0 1.59 0.01
Parameter File I/O 24 0 0 0 0.41 0.01
direct path write 6 0 0 1 0.10 0.00
Disk file operations I/O 54 0 0 0 0.93 0.00
rdbms ipc message 17,637 97 61,836 3506 304.09
Streams AQ: waiting for time management or cleanup tasks 5 60 11,053 2210602 0.09
DIAG idle wait 7,203 100 7,203 1000 124.19
PX Idle Wait 1,802 100 3,604 2000 31.07
pmon timer 1,212 99 3,603 2973 20.90
Space Manager: slave idle wait 726 99 3,603 4963 12.52
smon timer 12 100 3,600 300004 0.21
Streams AQ: qmn slave idle wait 128 0 3,583 27993 2.21
Streams AQ: qmn coordinator idle wait 256 50 3,583 13996 4.41
SQL*Net message from client 293 0 2 5 5.05
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Wait Event Histogram
• Units for Total Waits column: K is 1000, M is 1000000, G is 1000000000
• % of Waits: value of .0 indicates value was <.05%; value of null is truly 0
• % of Waits: column heading of <=1s is truly <1024ms, >1s is truly >=1024ms
• Ordered by Event (idle events last)
% of Waits
Event Total Waits <1ms <2ms <4ms <8ms <16ms <32ms <=1s >1s
ADR block file read 173 80.3 5.2 2.3 5.8 1.7 4.6
ADR block file write 99 96.0 3.0 1.0
ADR file lock 102 100.0
Disk file operations I/O 165 100.0
LGWR wait for redo copy 11 90.9 9.1
Parameter File I/O 24 100.0
SGA: allocation forcing component growth 8 100.0
SQL*Net break/reset to client 6 100.0
SQL*Net message to client 4992 100.0
SQL*Net more data from client 20 100.0
asynch descriptor resize 541 100.0
change tracking file synchronous read 56 83.9 1.8 14.3
change tracking file synchronous write 56 80.4 7.1 1.8 10.7
control file parallel write 1262 80.3 1.7 .6 .6 .8 1.3 14.7
control file sequential read 6866 94.1 .9 .7 .7 .3 .4 2.9
db file parallel write 628 94.3 2.1 1.0 .8 .3 .3 1.3
db file scattered read 3457 72.6 7.2 5.4 6.9 5.7 .5 1.6
db file sequential read 4525 78.7 2.7 1.8 9.6 5.3 .4 1.5
direct path read temp 764 40.2 18.6 9.4 6.2 11.0 5.8 8.9
direct path sync 1 100.0
direct path write 6 83.3 16.7
direct path write temp 259 .4 1.2 88.8 .4 9.3
enq: RO - fast object reuse 14 42.9 42.9 7.1 7.1
latch free 1 100.0
latch: cache buffers lru chain 2 100.0
latch: checkpoint queue latch 2 100.0
latch: messages 2 100.0
latch: object queue header operation 2 100.0
latch: redo allocation 1 100.0
latch: row cache objects 1 100.0
local write wait 44 100.0
log buffer space 2 50.0 50.0
log file parallel write 383 92.4 .8 1.0 5.7
log file sync 39 82.1 2.6 2.6 12.8
os thread startup 17 100.0
process diagnostic dump 94 34.0 63.8 2.1
reliable message 7 100.0
utl_file I/O 12 100.0
DIAG idle wait 7204 100.0
PX Idle Wait 1802 100.0
SQL*Net message from client 5067 87.1 6.6 1.0 .5 .5 .1 .5 3.7
Space Manager: slave idle wait 726 .6 99.4
Streams AQ: qmn coordinator idle wait 256 49.2 .8 50.0
Streams AQ: qmn slave idle wait 128 100.0
Streams AQ: waiting for messages in the queue 721 100.0
Streams AQ: waiting for time management or cleanup tasks 5 40.0 20.0 40.0
class slave wait 17 100.0
pmon timer 1212 .9 99.1
rdbms ipc message 17.6K 1.8 .4 .2 .2 .1 .1 21.0 76.2
smon timer 12 100.0
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I couldnt add the rest of the report here since it is telling me I have exceeded 30000 characters. If you want to see the full report, please email me at [email protected]Unless your database is strictly a DSS-type of database, your AWR report exposes loads of issues with it. And I think none of the time during the AWR window was spent on database. Look at the DB time (with all those multi cores) compared with the elapsed time of the AWR.
As you are on 11g, why not make use of MEMORY_TARGET (a single parameter to manage both SGA and PGA)? If you are already on it, ignore this as I can't see it anywhere. If not, get rid of SGA_TARGET and PGA_AGGREGATE_TARGET and replace it with a single MEMORY_TARGET parameter. However you may have a minimum threshold set for different SGA pools so that they won't shrink beyond that point.
Having said that, setting MEMORY_TARGET is not a guarantee to avoid ORA-4030. Just a single bad PL/SQL code could go and exploit the untunable part of your process memory and even go and blow up the physical memory. If you are using FORALL and BULK load, see if you can cut it down into few chunks rather than running as a single process.
What does your V$PGASTAT say?
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